EP3528304B1 - Secondary battery and method for manufacturing the same - Google Patents

Secondary battery and method for manufacturing the same Download PDF

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Publication number
EP3528304B1
EP3528304B1 EP18783648.1A EP18783648A EP3528304B1 EP 3528304 B1 EP3528304 B1 EP 3528304B1 EP 18783648 A EP18783648 A EP 18783648A EP 3528304 B1 EP3528304 B1 EP 3528304B1
Authority
EP
European Patent Office
Prior art keywords
secondary battery
temperature
gasket
hot melt
top cap
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP18783648.1A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3528304A1 (en
EP3528304A4 (en
Inventor
Do Gyun Kim
Sang Suk JUNG
Byoung Kook Lee
Hang Soo Shin
Geon Woo Min
Byoung Gu Lee
Chan Bae Kim
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LG Energy Solution Ltd
Original Assignee
LG Energy Solution Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Publication of EP3528304A1 publication Critical patent/EP3528304A1/en
Publication of EP3528304A4 publication Critical patent/EP3528304A4/en
Application granted granted Critical
Publication of EP3528304B1 publication Critical patent/EP3528304B1/en
Active legal-status Critical Current
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
    • H01M50/171—Lids or covers characterised by the methods of assembling casings with lids using adhesives or sealing agents
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0422—Cells or battery with cylindrical casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/049—Processes for forming or storing electrodes in the battery container
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
    • H01M50/167—Lids or covers characterised by the methods of assembling casings with lids by crimping
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/183—Sealing members
    • H01M50/186—Sealing members characterised by the disposition of the sealing members
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/183—Sealing members
    • H01M50/19—Sealing members characterised by the material
    • H01M50/193—Organic material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/183—Sealing members
    • H01M50/19—Sealing members characterised by the material
    • H01M50/197—Sealing members characterised by the material having a layered structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present invention relates to a secondary battery and a method for manufacturing the same, and more particularly, to a secondary battery, in which a sealing property is improved, and a method for manufacturing the same.
  • Batteries (cells) that generate electric energy through physical or chemical reaction to supply the generated electric energy to the outside are used when AC power to be supplied to the building is not obtained, or DC power is required according to the living environments surrounded by various electric and electronic devices.
  • primary batteries and secondary batteries which are chemical batteries using chemical reaction
  • the primary batteries are consumable batteries which are collectively referred to as dry batteries.
  • secondary batteries are rechargeable as dry batteries.
  • secondary batteries are rechargeable batteries that are manufactured by using a material in a redox process between current and a substance is repeatable several times. When the reduction reaction is performed on the material by the current, power is charged, and when the oxidation reaction is performed on the material, power is discharged. Such the charging-discharging is repeatedly performed to generate electricity.
  • a lithium ion battery of the secondary batteries is manufactured through the following processes.
  • An active material is applied to each of a positive electrode conductive foil and a negative electrode conductive foil at a predetermined thickness, and a separator is disposed between the positive electrode conductive foil and the negative electrode conductive foil, and then, an electrode assembly, in which the positive electrode conductive foil, the separator, and the negative electrode conductive foil are wound several times in a jelly-roll or cylindrical shape, is accommodated into a cylindrical or prismatic can, a pouch, and the like to seal the resultant product, thereby manufacturing the lithium ion battery.
  • a non-permeable sealing member for non-aqueous electrochemical cells according to the related art is disclosed in Korean Patent Publication No. 10-2010-0036316 .
  • sealing of a gasket part is achieved by pressing and sealing a gasket together with an upper end of a can member through a physical force.
  • JP H06 260211 relates to a secondary battery.
  • an object of the prevent invention is to provide a secondary battery, in which a sealing property is improved, and a method for manufacturing the same.
  • a secondary battery includes: a can member having an opening; a top cap assembly sealing the opening; a gasket insulating the opening from the top cap assembly; and a hot melt applied to an entire surface of the gasket, coupling to the can member, and to an entire surface of the gasket coupling to the top cap assembly, wherein the hot melt has fluidity and viscosity at a predetermined temperature or more and is hardened at a temperature less than the predetermined temperature.
  • the predetermined temperature may be a glass transition temperature (Tg).
  • the predetermined temperature may be 60 °C.
  • the hot melt may have an adhesive property at the predetermined temperature or more.
  • the hot melt may include a material that repeatedly has a state of having a viscosity at the predetermined temperature or more and a hard state at a temperature less than the predetermined temperature according to the temperature increases and decreases.
  • the hot melt may be made of a combination of a thermoplastic resin and a tackifier.
  • the hot melt may further include a coupling agent.
  • the thermoplastic resin may include a polyester-based resin.
  • the tackifier may include at least one or more of a phenol-based resin, a carbon-based resin, and a rosin-based resin.
  • the coupling agent includes at least one or more of aminosilane and vinylsilane, which are silicon-based materials.
  • a method for manufacturing a secondary battery includes: a preparation step of preparing a can member, a top cap assembly, and a gasket; a coating step of applying a hot melt that is dissolved in an organic solvent to a surface of the gasket; a drying step of drying the gasket to evaporate the organic solvent after the coating step; an assembly step of assembling the cap member and the top cap assembly with the gasket after the drying step to manufacture a secondary battery; and an activation step of activating the secondary battery, wherein, in the activation step, the hot melt is changed in phase according to a temperature change, and the gasket airtightly adheres to the can member and the top cap assembly by the hot melt that is changed in phase.
  • the activation step may include: a room-temperature aging process of aging the secondary battery at room temperature; a high-temperature aging process of aging the secondary battery under a temperature environment of 60°C or more that is higher than that of the room-temperature aging process; and a charging/discharging process of charging and discharging the secondary battery under a temperature environment of 60°C or less that is lower than that of the high-temperature aging process after the high-temperature aging process.
  • the hot melt may be in a hard state during the room-temperature aging process, be changed in phase to a material having fluidity and viscosity during the high-temperature aging process, and be hardened again at room temperature.
  • the organic solvent may include at least one or more of toluene, xylene, and methyl ethyl ketone.
  • the gasket may adhere to the can member and the top cap assembly to improve the sealing property.
  • the coupling agent may be contained in the hot melt applied to the gasket to improve the adhesive property and enhance the waterproof property.
  • the hot melt may be applied to the gasket to increase the chemical resistance.
  • FIG. 1 is a perspective view of a secondary battery according to an embodiment of the present invention
  • FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1 .
  • a secondary battery includes a can member 10, in which an opening 11 is defined, a top cap assembly 20 sealing the opening 11, a gasket 30 insulating the opening 11 and the top cap assembly 20 from each other, and a hot melt 40 applied to a surface of the gasket 30.
  • the can member 10 may be a container made of a metal material and having a shape that is opened substantially upward in a cylindrical or prismatic type lithium ion secondary battery.
  • the can member 10 may be made of aluminum (Al) or steel plated with nickel (Ni) which is light and easy to cope with corrosion.
  • the can member 10 serves as a container for an electrode assembly and an electrolyte. After the electrode assembly is inserted into the can member 10 through the opened upper end of the can member 10, i.e., the opening 11 defined in the upper end of the can member 10, the opening 11 defined in the upper end of the can member 10 is sealed by the top cap assembly 20.
  • the gasket 30 is made of an insulation material. An inner circumference of the gasket 30 is closely attached to the top cap assembly 20 to insulate the can member 10 and the top cap assembly 20 from each other, and an outer circumference of the gasket 30 is closely attached to the opening 11 of the can member 10.
  • the can member 10 further include a crimping part 10a for bending an opening-side circumference that is the upper end of the can member 10 to fix the top cap assembly 20 sealing the opening 11 of the can member 10.
  • the gasket 30 may be installed between the opening 11 of the can member 10 and the top cap assembly 20 so as to be pressed and fixed to the can member 10 together with the top cap assembly 20 by using a crimping part 10a.
  • the hot melt 40 is applied to the surface of the gasket 30.
  • the hot melt 40 may be selectively applied to the entire surface or a portion of the surface of the gasket 30.
  • the hot melt 40 may be made of a combination of a thermoplastic resin and a tackifier and may further contain a coupling agent to improve adhesive property and enhance a waterproof property.
  • the thermoplastic resin may include a polyester-based resin.
  • the tackifier may be at least one or more of a phenol-based resin, a carbon-based resin, a rosin-based resin and the like and have a property having viscosity or adhesion.
  • the coupling agent may be at least one or more of aminosilane, vinylsilane, and the like, which are silicon-based materials, and be a material capable of being bound to oxide of a metal surface.
  • the oxide binding on the inner surface of the metal can member 10 may significantly improve the adhesive property and sealability.
  • the hot melt 40 may have a property of having fluidity and viscosity while being melted at a glass transition temperature Tg of 60°C or more.
  • the hot melt 40 may be maintained in a hard state at room temperature and have the adhesive property while being melted at the glass transition temperature that is a predetermined temperature.
  • the hot melt 40 may have a material property that is capable of repeatedly having the state of having a viscosity at the glass transition temperature or more and the hard state below the glass transition temperature according to the temperature increases and decreases.
  • FIG. 3 is a partial enlarged view illustrating a main part of allowing a gasket to adhere to a top cap assembly and a can member in FIG. 2 .
  • the inner circumference of the gasket 30 may adhere to the top cap assembly 20, and the outer circumference of the gasket 30 may adhere to the can member 10.
  • the hot melt 40 may be applied to the surface of the gasket 30 at room temperature. Since the hot melt 40 does not have the fluidity and viscosity at room temperature, the hot melt 40 may be only applied to the surface of the gasket 30 and thus may not significantly affect the adhesion of the gasket 30.
  • the gasket 30 may be assembled and installed between the can member 10 and the top cap assembly 20 in the state in which the hard hot melt 40 is applied to the gasket 30. After being assembled, the gasket 30 may be put into an activation process in a state of being pressed.
  • the temperature increases at a temperature of 60°C or more that is the glass transition temperature and then decreases again at room temperature. In this process, the adhesion between the gasket 30 and the can member 10 may be completed.
  • a predetermined temperature and pressure may be applied to the hot melt 40 at the same time to allow the hot melt 40 to have the fluidity so that the hot melt 40 is permeated and filled into a fine gap between the coupled surfaces.
  • the gap may be a fine gap formed between the coupled portions or may be a fine gap 10b, a groove, a scratch, an unevenness, or the like, which is formed in the coupled surface of the opening 10 of the can member.
  • the hot melt 40 since the hot melt 40 has the viscosity, the hot melt 40 may serve as a sticky medium between the gasket 30 and the top cap assembly 20 or between the gasket 30 and the can member 10.
  • the hot melt 40 may be hardened again.
  • the hot melt 40 may be permeated into the gap between the coupled surfaces and then hardened.
  • the gasket 30 and the top cap assembly 20 or the gasket 30 and the can member 10 may be very airtightly and strongly coupled to each other by the hot melt 40.
  • oxide coupling may be additionally achieved to obtain additional effects such as improvement in adhesion and enhancement in waterproof property.
  • FIG. 4 is a flowchart illustrating a method for manufacturing a secondary battery according to an embodiment of the prevent invention.
  • a method for manufacturing a secondary battery includes a preparation step (S1), a coating step (S2), a drying step (S3), an assembly step (S4), and an activation step (S5).
  • the preparation step (S1) may be a step of preparing a can member 10, a top cap assembly 20, and a gasket 30.
  • the coating step (S2) may be a step of applying a hot melt 40 to a surface of the gasket 30.
  • the hot melt 40 may be melted by using an organic solvent made of at least one or more of toluene, xylene, methyl ethyl ketone, and the like so that the hard hot melt 40 is applied to a surface of the gasket 30 at room temperature.
  • the melted solution may be applied to the surface of the gasket 30.
  • the drying step (S3) may be a step of drying the gasket 30 to evaporate the organic solvent after the coating step (S2). After the organic solvent is evaporated, only the hot melt 40 may remain on the surface of the gasket 30 to form a coating layer of the hot melt 40 on the surface of the gasket 30.
  • the assembly step (S4) may be a step of assembling a top cap assembly 20 and the gasket 30 with a can member 10 in which an electrode assembly and an electrolyte are accommodated after the drying step (S3) to manufacture a secondary battery.
  • the activation step (S5) may be a step of activating the manufactured secondary battery.
  • the activation step (S5) may include a room-temperature aging process of aging the secondary battery at room temperature, a high-temperature aging process of aging the secondary battery under a temperature environment 60°C or more that is higher than that of the room-temperature aging process, and a charging/discharging process of charging and discharging the secondary battery under a temperature environment of 60°C or less that is lower than that of the high-temperature aging process after the high-temperature aging process.
  • the hot melt 40 may be in the hard state during the room-temperature aging process and be changed in phase to a material having fluidity and viscosity during the high-temperature aging process and then be hardened again during the charging/discharging process and at room temperature.
  • the adhesion between the gasket and the can member may be completed.
  • the process of completing the adhesion according to the temperature change is the same as described above, and thus, its description will be omitted.
  • the method for assembling the second battery according to an embodiment of the present invention may have a great advantage in that the hot melt 40 applied to the gasket 30 strongly adhere to the can member 10 and the top cap assembly 20 while the activation step (S5) of the secondary battery is performed without a separate additional process to improve sealing property. Since the activation step is the existing process, it is unnecessary to separately perform a heating process for the adhesion of the gasket.
  • the gasket may adhere to the can member and the top cap assembly to improve the sealing property.
  • the coupling agent may be contained in the hot melt applied to the gasket to improve the adhesive property and enhance the waterproof property.
  • the hot melt may be applied to the gasket to completely block the moisture permeation and significantly suppress the corrosion, thereby improving chemical resistance.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Secondary Cells (AREA)
EP18783648.1A 2017-04-14 2018-03-23 Secondary battery and method for manufacturing the same Active EP3528304B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020170048646A KR102285978B1 (ko) 2017-04-14 2017-04-14 이차전지 및 그 이차전지의 제조방법
PCT/KR2018/003407 WO2018190530A1 (ko) 2017-04-14 2018-03-23 이차전지 및 그 이차전지의 제조방법

Publications (3)

Publication Number Publication Date
EP3528304A1 EP3528304A1 (en) 2019-08-21
EP3528304A4 EP3528304A4 (en) 2019-12-25
EP3528304B1 true EP3528304B1 (en) 2022-05-04

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP18783648.1A Active EP3528304B1 (en) 2017-04-14 2018-03-23 Secondary battery and method for manufacturing the same

Country Status (6)

Country Link
US (2) US20200295318A1 (ja)
EP (1) EP3528304B1 (ja)
JP (1) JP6981602B2 (ja)
KR (1) KR102285978B1 (ja)
CN (1) CN110140229B (ja)
WO (1) WO2018190530A1 (ja)

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Also Published As

Publication number Publication date
KR20180116003A (ko) 2018-10-24
WO2018190530A1 (ko) 2018-10-18
CN110140229A (zh) 2019-08-16
US20200295318A1 (en) 2020-09-17
CN110140229B (zh) 2022-06-14
US20220093998A1 (en) 2022-03-24
JP6981602B2 (ja) 2021-12-15
EP3528304A1 (en) 2019-08-21
EP3528304A4 (en) 2019-12-25
JP2020514950A (ja) 2020-05-21
KR102285978B1 (ko) 2021-08-04

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